THE WATER CABINET. 145 
unless confined by a glass lid or gauze. But he is now 
a true trog. delicately mottled, agile in his movements, 
very clever in Jumping and swin- 
ming—his tadpole tail entirely ab- 
sorbed, and his whole system me- 
tamorphosed. If he interested us 
before, he is still more interesting 
now, for in the structure and 
economy of his frame Nature reveals 
phenomena typical of animal life in all its orders and 
gradations. Hence the frog is the victim of the philoso- 
pher; he suffers spasm under the galvanic wire, blindness 
under the glare of the microscope lamp, tetanus through 
being dosed with strychnine, and innumerable other 
agonies in which operators detect analogies that throw a 
light on the fundamentals of animal life, and that even 
aid in the explanation of the subtle organism of man 
himself. 
MANAGEMENT OF THE CaBINET.—The instructions 
already given for the management of Aquaria will be 
found to embrace most of the points involved in the 
management of beetle and larva jars, for these are but 
Aquaria on a smaller scale. The chief matter is to 
separate the species as much as possible, so that the car- 
nivorous kinds shall not destroy the harmless ones ; and 
on this plan the study of each kind is greatly facilitated. 
Since the jars afford the best means for the culture of 
choice aquatic specimens of the various kinds of Riccia, 
Conferva, Nitella, Lemna, and other minute water-weeds 
may be used for maintaining the necessary balance in 
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