EMBRYOLOGY AND CLASSIFICATION. 297 
no man capable of original research has the 
time to prepare for the uninitiated the attendant 
circumstances essential to his more difficult in- ° 
vestigations, or to train their eyes to see what 
he sees. So is it also with the microscopic 
observer ; the deeper insight he has gained by 
long training in steadiness of hand and eye, as 
well as in the concentration of intellect that 
makes the brain work harmoniously with them, 
he cannot communicate. He may interest and 
amuse his friends and visitors with some easy 
exhibition of specimens under the microscope ; 
he may open the door into the laboratory of 
Nature, but he cannot invite them to cross the 
threshold or to enter in with him. I think 
people are not generally aware of the difficulty 
of microscopic observation, or the amount of 
painful preparation required merely to fit the 
organs of sight and touch for the work. In old 
times men prepared themselves with fast and 
vigil for entrance into the temple; and Nature 
does not open her sanctuary without exacting 
due penance from her votaries. It seems an 
easy matter for a man to sit down and look at 
objects through a glass which enlarges every- 
thing to his vision; but there are subjects of 
microscopic research so obscure that the student 
must observe a special diet before undertaking 
his investigation, in order that even the beating 
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