IT ha-s remntly been demonstrated that the most critical factor determining the epidermal mitosis rate in the adult mouse is the carbohvdrate supplv to the ceUs, and the evidence at present available aR points to the conclusion that the fimction of this carboh drate is to supplv the energy needed during ceR division y (BuRougb, 1949a(BuRougb, , 1950a. In extending this work the discoverv has been made that a restricted diet has a powerful effect in depressino, mitotic activitv (Bullough, 1949b), and it has been suggested that this observation mav help towards an explanation of Tannenbaum's remarkable results on the effects of restricted diets on tumourgenesis (Tannenbaum, 1940a(Tannenbaum, , 1940b(Tannenbaum, , 1942(Tannenbaum, , 194-4, 1945(Tannenbaum, , 1947 The two experiments performed involved a total of a-a-mice, which were aR adult males of between 3 and 5 months of age. In the first experiment the -95 animals included 10 Strong's CBA males and 15 K-reyberg's white label males. l[n the second experiment aR the animals were Strong's CBA males.These mice had been reared since weaning on a mixed diet of commercial rat cake with cod-hver oil, flaked maize, and dog biscuit, but during the experiments they were fed on commercial rat cake alone. They invariably received their food between 09.00 and 10-00 hours, so that they formed the habit of being awake and active at that time and of being asleep in the earlv afternoon. This determined the form of their diurnal cycle of mitotic activitv, and ensured that a high mitosis rate developed shortly after midda (BuRough. 1948). The experiments were carried out during the winter and earlv spring, and the ainimals were exposed to normal daybght. * Sorby Fellow of the Royal Society of London.

This work was carried out during the two successive winter seasons of 2014/ 2015 and 2015/ 2016 at Meet Assas village, (Private Farm) Gharbieh Governorate, Egypt, on sweet fennel plants, to investigate the utilization of some different sources and rates of organic manure (chicken and farmyard manure) at 50 and100 % of recommended rate / fed., foliar fertilizer of seaweed extracts ( without and with 2 g / liter) compared with mineral NPK fertilizer at 50 and 100 % of recommended rate /fed., and their interaction on plant growth, yield (bulb and fruit fennel) and chemical composition. The application of farmyard manure at 100 % with seaweed extract showed increased growth compared to the chicken manure at 100% or inorganic fertilizer at 100% with seaweed extracts in the plant fresh and dry weight, plant height, number of leaves, bulb and fruits yield, as well as essential oil. Similarly, chemical parameters have also shown increased from farmyard manure over the inorganic fertilizers. Thus our study provides the evidence for using seaweed extract with organic fertilizer like farmyard manure by farmers to have better yield to produce from bulbs and fruits, organic manure is easy available, environmentally safe and cost effective in sweet fennel plants

This work was carried out during the two successive seasons of 2014/ 2015 and 2015 / 2016 at Private Farm in Sammnoud, Gharbiyah Governorate, Egypt, to investigate the utilization of some micronutrients (Zn and Mn) and plant extracts [garlic (Allium sativum L) and aloe (Aloe vera)] and their effects on plant growth, yield (fruit essential oil), chemical composition and control against powdery mildew (Erysiphe heraclei) in dill plants. The application of plant extracts with micronutrients showed increased plant growth, yield (fruit and essential oil) and control against powdery mildew compared to plant extracts or micronutrients individually. The highest values of plant growth and yield (fruit and essential oil) and the lowest percentages of powdery mildew incidence and severity resulted from sprayed plants by garlic extract plus Zn and Mn treatment. Thus our study provides the grater results for using garlic extract with micronutrients by farmers to have better yield from fruit and essential oil in dill plants, as well as reduce the incidence of powdery mildew, it is easy available, environmentally safe and cost effective.

The present work was carried out at a private Farm in Sammenoud area, Gharbieh Governorate during the two successive seasons of 2011-2012 and 2012-2013. The present study aimed to investigate the effect of bio fertilizers (VAM fungi and phosphorine) and foliar spray of plant extracts (garlic and aloe) on some vegetative growth (plant height, fresh and dry weight) essential oil percentage and chemical constituents of sage (Salvia officinalis L.) plant under different water stress conditions (plants irrigated every 15, 30 and 45 days). The results showed that irrigation of plants every 15 and 30 days were effective in increasing the productivity of vegetative growth, essential oil percentage and uptake of N,P and K % in sage. Spraying plants with garlic extract was more effective than aloe extract at in improving the productivity of vegetative growth, essential oil percentage and uptake of N, P and K content. Plants treated with VAM fungi were effective in increasing the productivity of vegetative growth, essential oil percentage and uptake of N, P and K %.

The present study was carried out at Mansoura Horticulture Research Station, Dakahlia Governorate, Hort. Res. Institute, Agric. Res. Center, Ministry of Agric., during the two successive seasons (2011/2012) and (2012/2013) to study the effects of irrigation intervals and micronutrients on growth, herb yield, leaves yield, essential oil production and its components of rosemary (Rosmarinus officinalis L.) plant. The results showed that: irrigation interval every 7 days resulted in significant increase in vegetative growth characters as well as essential oil content per plant, but irrigation interval every 21 days increased essential oil percentage in the two cuts during the both seasons. Foliar spray with micro elements Fe, Zn, Mn individually and mixture between them recorded significant increase in vegetative growth, as well as the highest essential oil content per plant in the first and second cuts of the two seasons compared to the control. In addition, the previous values of characters were increased by using (Mn) to reach their maximum values by using the mixture of (Fe+Zn+Mn) at 150 ppm in both cuts of the two seasons. The interaction between irrigation interval every 7 days with foliar spray of a mixture, followed by Mn at 150 ppm gave significant increase in vegetative growth, as well as the highest essential oil content per plant in the first and second cut of the two seasons. In addition, the irrigation intervals every 21 days with same spraying treatments gave the highest essential oil percentage compared to other ones or the control plants. The irrigation interval every 21days gave the highest main components of essential oil (camphor, 1.8-cineole and α-pinene) which recorded (50.04 %), while the interaction between irrigation interval every 21days with foliar spray (Mn) at 150 ppm gave the highest main components (65.53 %) followed the mixture of the microelements (60.85 %) of the rosemary essential oil.