PROBLEMS OF MODERN SCIENCE 



of tissues and cells. He classifies his material in 

 accordance with the mutual resemblances and 

 differences exhibited by individuals, and the more 

 detailed his investigation of their structure the 

 more satisfactory will his classification be. His 

 object, however, is something more than the 

 mere naming and recognition of species, genera, 

 orders, and so forth, for what may be called 

 museum purposes. He is, or should be, an evolu- 

 tionist, for he also aims at reconstructing the great 

 tree of life by tracing all the phylogenetic relation- 

 ships of the organisms which he studies. The 

 successful systematist, whether in Zoology or 

 Botany, must, from the nature of the case, be a 

 specialist. The number of species of plants and 

 animals, and the literature pertaining thereto, are 

 so vast that no one human intelligence could 

 deal with them all. The day of Linnasus has long 

 gone by. 



Thus we have our Protozoologists, our Mycolo- 

 gists, our Spongologists, our Malacologists, our 

 Entomologists, our Ornithologists, our Anthro- 

 pologists, and so forth, and the most appropriate 

 sphere for the labours of most of these is clearly 

 that afforded by the great museums, for here only 

 is it possible to accumulate the collections and 

 libraries which systematic work requires. It 

 would be a great misfortune, however, if work 

 of this kind were to be altogether divorced from 

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