HIS CONTRIBUTIONS TO SCIENCE. 549 



ties, and the transactions of State agricultural and horticul 

 tural societies. They are of inestimable value to the student 

 or practical man desirous of exploring the mysteries of 

 science. 



His lectures and essays on &quot; Practical Education&quot; have 

 been published in various periodicals both East and West ; 

 that &quot;On the Three Great Races of Men, the White, the 

 Yellow, and the Black,&quot; published in book-form. The dis 

 courses &quot;On Microscopic Insects;&quot; &quot;On Matter, Force, 

 and Spirit;&quot; &quot; On the Ocean Currents and Open Sea at 

 the Poles;&quot; and his remarks on tornadoes, delivered at the 

 anniversaries of the Illinois Natural History Society, dur 

 ing his presidency of the same, from 1858 to 1862; his 

 premium essay &quot;On Cultivation of Crops;&quot; and papers &quot;On 

 Industrial Education,&quot; are all published in the third, fourth, 

 and fifth volumes of the Illinois State Agricultural Society 

 Transactions. 



&quot; An Essay on the Forces that promote Vegetable Growth,&quot; 

 read before the Illinois Horticultural Society, was published 

 in the fifth volume of their Transactions. &quot; The Discourse 

 on Climate,&quot; delivered before the Illinois Industrial Uni 

 versity, together with his address at the laying of the cor 

 ner-stone of their new university buildings, was published 

 in the Fourth Annual Report of that University. 



These discourses cover an immense range and variety of 

 topics and subjects. They suggest many varied and original 

 lines of thought for our consideration, not found in any other 

 book or books whatever; and whatever errors or defects 

 may attach to them, they could hardly fail to lift the 

 reader into a new and higher region of thought and action 

 and enterprise than even most of our more minute specialists 

 in science have as yet attained. 



These writings have attracted the attention and admira- 



