Proceedings of Scientific Societies. 

 sights to the corks. The apparatus , 



rt-uv. so :l- 



to 



form a 



rt of head. 



Tl 



e tacks 



re then arrac 



ged 



n rows 



some shalh 



w ,! 



di. ]>iv- 



ouslv oiled. 



and 



enough 



aster of P 





poured 



Fig. II. Ether was 

 vapor upon collodion or celloidin 



them to the slide. The tube of calcium chloride pla 



(Ca CI 2) is for dehydrating the ether vapor, around them to form a 



layer 1 J to 2 cm. deep. When this hardens, the tacks are firmly held 

 in an upright position, and all that remains to be done is to place the 

 plaster disc in the bottom of the glass jar. 



To use the apparatus, fill it partly full of alcohol (60 to 80 per 

 cent.). As the specimens are imbedded on the corks, transfer them 

 to this jar, sticking each cork upon a tack. 



PROCEEDINGS OF SCIENTIFIC SOCIETIES. 



Society of Naturalists— Met in Philadelphia, 



descriptions of three important expeditions which went out 

 The morning session was given up to the reading of four 

 '• Definite vs. Fortuitous Variation in Animals and Plants." 

 Thomas Meehan, Professor J. P. McMurrich, Professor J. A. 



