386 



APPENDIX. 



the light for three or four days, add 10 to 15 drops of tincture of iodine, 

 agitate, and allow to stand for some days. Stain for twelve to twenty-four 

 hours, and wash out for the same time in 90 per cent, alcohol, acidulated 

 with acetic acid. 



771. Carbonate of Soda Carmine (CUCCATI, Zeit.f. wiss. Mile., iv, 1, 

 1887, p. 50). This carmine is stated to have a bleaching action on the 

 retina of Arthropods. Apart from that, it appears to me superfluous. 



772. The Laboratory Table. The following list is intended for a 

 memorandum of the reagents required for ordinary zoological work, and is 

 given in the belief that it may be useful as a reminder to those whose duty 

 it is to furnish tables for students in public laboratories, and as advice to 

 any beginner who may desire to set up a table for himself. The list com- 

 prises reagents alone, and of these only such as I apprehend are really 

 necessary for the general scope of zoological work. It gives the material 

 necessary for one student only, and states the minimum quantity of each 

 reagent required. The items marked with asterisks are considered to be not 

 strictly indispensable, and may be omitted if it be desired to simplify the 

 table. By "the table " is of course meant the actual table supplemented by 

 shelf or cupboard space. 



The prices affixed to the several reagents are approximate only, as the 

 market price of these commodities is variable. They are taken from recent 

 notes kindly furnished me by Dr. Griibler, and indicate the prices both of 

 the raw reagents and of reagents made up for use by him these latter 

 being, of course, somewhat in excess of the market value of the raw 

 chemicals. 



