The composition of plume produced during carbon dioxide laser endoscopic treatment for endometriosis was examined to determine whether it represented a hazard to the surgical staff. A total of 32 plume samples were collected from 17 women undergoing laser laparoscopic treatment for endometriosis and/or adhesions. The smoke was found to consist of particles having a median aerodynamic diameter of 0.31 micron with a range of 0.10-0.80 micron. The size range has two consequences: 1) using a human red blood cell as a model for all cells, it can be stated with greater than 99.9999% certainty that no cell-size particles, including cancer cells, are present in the plume; 2) particles in this size range are too small to be effectively filtered by currently available surgical masks.

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The r e a c t i o n s o f eleven a l k y l c h l o r i d e s and bromides w i t h t r i m e t h y l t i n s o d i u m have been examined. t o provide good y i e l d s o f s u b s t i t u t i o n products i n THF and TG a t 0". s a t i s f a c t o r y f o r a l l y 1 bromide and u n s a t i s f a c t o r y f o r cinnamyl c h l o r i d e and t e r t i a r y h a l i d e s . Trimethyl tinsodium and 2-chlorobutane r e a c t w i t h second o r d e r k i n e t i c s . o f the halides have been determined i n the two solvents and are discussed. Lithium, sodium and potassium as counterions y i e l d e d the same r e s u l t s i n t h e r e a c t i o n o f t h e t r i r n e t h y l t i na l k a l i s w i t h primary, secondary and t e r t i a r y b u t y l bromides i n THF.I t has been found t h a t primary and secondary halides r e a c t smoothly and r a p i d l y

and pass the same into a law during the present session of Parliament. And vour Petititoners will ever prav. &c.