126 PROCEEDINGS OF THE CALIFORNIA 



say in November, would more than repay the expense, as thousands of insects 

 would be thus destroyed that otherwise would be feeding on the juices of the 

 vine during the next five months. This, however, must not supersede the use 

 of the poison in the spring at the time when the winter eggs are developed. 



In the roots shown this evening the healthy appearance of the new rootlets 

 on the treated vines is a sufficient proof of the absence of the phylloxera, al- 

 though I would state that after a careful examination I have not detected a 

 single insect. The roots that were not treated have not thrown out a single 

 rootlet. It is needless to remark that the vines that were treated all showed 

 evidences of being attacked by the disease last season, as is evident from the 

 appearance of the roots, although not an insect is to be found on them at 

 present. 



Where the vines have not been already attacked, I believe the application 

 of train oil to the stem and the gas works lime to the surface round the top of 

 the root will protect them, or a small quantity of the bisulphide introduced 

 near the root a few inches beneath the surface in the spring, would certainly 

 save them from the attack of the insect. 



Mr. G-uerin read a paper on the Factor of Safety in "Water 

 Pipes. 



Regular Meeting, November 3d, 1876. 

 Dr. Stout in the Chair. 



Ten members present. 



L. A. Scowden was proposed for resident membership. 



Donations to the Museum: From "W. J. Fisher, specimens of 

 cenlropomus, trachynotus pampanus, octopus, 22 birds and 110 

 shells; from J. M. Dore, specimen of echeneus maceatus; from 

 Henry Edwards, two fish — one mineral and slab containing fos- 

 sil; from John Torrence, California gopher. 



