100 Beard, On the Occurrence of Dextro-rotatory Albumins in Organic Nature. 



of loose particles. 10. 25 Daphnia active, heart pulsating. Ecto- 

 dermal cells of Hydra largely macerated off. 10. 37 Hydra now 

 shapeless and largely disintegrated. Parasitic Trichodinae dissolved. 

 Daphnia active and apparently unchanged. Experiment closed. 

 The specimens of Daphnia with their ferment-environment were 

 now placed in a beaker, and 50 c. c. of fresh clean rain-water were 

 added. Thirty hours later the Daphnia appeared to be all alive 

 and active. Forty-eight hours after the close of the experiment 

 some, at all events, of the Daphnia were alive and active. The 

 weather had now become very warm. 



XL Amoeba. An Amoeba was placed in a cell along with three 

 drops of clean fresh rain-water and one drop of the 10 c. c. solution 

 of T. & A. This was done at 10. 50 a. m. By 10. 51 the Amoeba 

 had been found under the microscope. It was then rounded and its 

 pseudopodia, such as they were, gave it the appearance of a horse- 

 chesnut in its shell. 10. 52 Amoeba sending out pseudopodia. 

 11. a. m. There are still movements in its interior, and pseudo- 

 podia are still present. 11. 7 Contraction of contractile vacuole. 

 11. 10 Still moving by means of pseudopodia. 11. 17 No pseudo- 

 podia. Curious linear wormlike movements. 11. 21 Nuclear end 

 contracted, while the other end is still moving in wormlike fashion. 

 11. 28 Appearance tadpole-like. 11. 29 Nuclear end a rounded 

 mass with soap-bubble-like ectosarc. 11. 30 Dumb-bell-shape with 

 narrow bridge between the two ends. 11. SO 1 /^ No movements in 

 interior. 11. 32 New blunt process formed at side of larger portion. 

 11.34 Contents of new process now flowing back into main portion. 

 11. 40 Another blunt process formed, quick movements in its interior. 

 11. 45 Broken into two pieces, of these the one never stirs again, 

 the other moves a little, then rounds up, and remains still. Both 

 dead. Experiment ended. 



XII. Cordylophora lacustris, Carchesium polypinum, and a 

 Hydrachnid or water-mite. The material of this experiment con- 

 sisted of two asexual generations, Cordylophora, a fresh and brackish 

 water polype, a very fine collection of it, and upon it here and 

 there colonies of the beautiful bell-animalcule, Carchesium, and a 

 sexual generation, a water-mite or Hydrachnid. This latter was 

 found in one of the watch-glasses used. In the following experiment 

 the glasses were under observation from 11.15 a.m. until 5p.m., 

 and 24 hours later than this the glass containing the Hydrachnid 

 was examined, and the water-mite was found to be still alive and 

 active. It had thus lived in a fluid containing these pancreatic 

 ferments for quite thirty hours, while its asexual companions had 

 long ceased to exist, as will be seen. The reagents of the experi- 

 ment were as follows. The usual 10 c. c. solution of T. & A. was 

 made up. Of this one cubic centimetre was further diluted with 



