24 Dv C. G. Ehrenberg on the Infusoria and other 



factures, and commerce, of mining and building, of inventing 

 and executing in every land — Colleges in which great che- 

 mists, great mechanics, great naturalists, great inventors, 

 are already working, in a professional manner, to aid and de- 

 velope all that capital, skill, and enterprise can do. Coming 

 from such Colleges to the central University, may we not 

 well look upon it as a great epoch in the life of the Material 

 Arts, that they have thus begun their university career — 

 that they have had the advantage of such academical arrange- 

 ments as there have been found, and still more, as I have 

 said, that they have had the greater advantage of intercourse 

 with each other ? May we not expect that from this time 

 the eminent producers and manufacturers, artizans and 

 artists, in every department of art, and in every land, will 

 entertain for each other an increased share of regard and 

 good-will, of sympathy in the great objects which man's office 

 as producer and manufacturer, artizan and artist, places be- 

 fore him — of respect for each other's characters, and for the 

 common opinion of their body, all increased by their being 

 able to say, " We were students together at the Great Univer- 

 sity in 1851/' 



On the Infusoria and other Microscopic Forms in Dust-showers 

 and Blood-rain. By Dr C. G. Eurenbekg. 



The infusorial character of the dust occasionally transport- 

 ed by winds, is one of the most interesting of Ehrenberg's 

 discoveries. His investigations have been reported from time 

 to time in the Berlin Memoirs and elsewhere, and notices of 

 some of his results have appeared in this journal. A me- 

 moir in the Memoirs of the Berlin Academy contains the 

 details of his various researches, with full pictorial illustra- 

 tions.* The plates contain, not only figures of all the forms 

 observed in each case, but a sketch of a portion of the dust 

 as it lay under the field of his microscope, exhibiting to the 

 eye the relative prevalence of different forms, and the colours 



* Vide Passatstaub und Staubregen. Grosses organisches unsichtbares Wirken 

 und Leben in der Atmosphiire. Von Ilrn. Ehrenberg. Abhandlungen dor 

 Academic der Wissenschaften zu Berlin, 1847. 



