( 439 ) 

 PKOCEEDINGS OF THE SOCIETY. 



Meeting of 12th April, 1882, at King's College, Strand, W.C, 

 The President (Professor P. Martin Duncan, F.R.S) in 

 THE Chair. 



The Minutes of the Meeting of 8tli March last were read and 

 confirmed, and were signed by the President. 



The List of Donations (exclusive of exchanges and reprints) 



received since the last meeting was submitted, and the thanks of the 



Society given to the donors. 



From 



Loew, O., and Bokorny, T. — Die Chemische Kraftquelle im 

 lebenclen Piotoplasma. viii. and 78 pp. (1 plate). 8vo, 

 Munchen, 1882 Dr. 0. Loew. 



Micrographic Dictionary. 4th ed. Parts 8, 9, and 10 .. .. Mr. Van Voorst. 



Postal Microscopical Society — Journal, vol, i. No. 1 The Society. 



Mr. M. M. Hartog (of Owens College) described some specimens 

 which he exhibited. One of these was a living larva of Apus cancri- 

 formis, the largest of the water fleas, the specimen shown having 

 been bred this spring from some mud received from Germany. The 

 other exhibits were a series of sections of Entomostraca which had 

 been prepared for histological study. The specimens were killed by 

 adding a few drops of osmic acid to the water in which they were 

 placed, and as soon as they fell to the bottom they were sometimes 

 removed to spirit direct ; this plan had its advantage inasmuch as 

 any mutilation was thereby avoided, but on the other hand by opening 

 them in the osmic acid a certain amount of maceration was avoidable, 

 which might in the former case prove to be detrimental to the 

 histological structure. They were first transferred to 30 per cent, 

 spirit, and then to 50 per cent., after which they were placed in 

 cochineal solution in 70 per cent, alcohol and washed repeatedly in 

 clean 70 per cent, alcohol until they gave up no more colour. After- 

 wards they were placed in 90 per cent., and then in absolute alcohol. 

 They were next treated after Giesbrecht's method, with a greasy 

 medium, and for this purpose whilst they were in the absolute 

 alcohol a small quantity of oil of cloves was j^oured in, this sank to 

 the bottom of the tube, and the Entomostraca would then lie not at 

 the bottom but just between the alcohol and the oil of cloves, which 

 gradually replaces the alcohol. In this way, with specimens which 

 had been unopened, he had obtained preparations in which there had 

 been absolutely no shrinkage of the protoplasm. Most of the oil of 

 cloves was poured away and the specimens having been imbedded in 

 a mixtui-e of spermaceti and castor oil, the sections were cut in the 

 usual way. It would be noticed that the sections were arranged in 

 series on the slide. By this means of preparation he had been able 

 to make out some important points. The specimens exhibited 



