EDITORIAL, 803 



at Iliillr iiukIc :iii iiitorostinj;- exhibit of :ip}):iratus ciiiploycd in its 

 work, hcihariii, specinien.s, etc.; and the .seed-testing station at Ham- 

 ))uri>- dispiaytHl cnlarg'ed photographs and samples of weed seeds of 

 different origin which have been found in grass and elover seed. 

 Samples of clover seed from different counti'ies with the several 

 impurities separated were displayed in watch glasses. The experi- 

 ment station at Kiel showed special apparatus, much of it original, 

 used in the examination of feeding stuff's for composition and purity; 

 and the station at Mai-burg exhibited Dietrich's appai'atus for deter- 

 mining the weathering of soil-producing rocks, and a rather compli- 

 cated A'egetation apparatus for studying the effect of specific bacteria 

 on plant growth. The Mockern station illustrated the Pettenkofer 

 respiration apparatus by means of charts, photographs, and models 

 of parts, and showed the results of expei'iments on the metabolism of 

 nitrogen, car])on, and energy with oxen. In the same line was an 

 exhibit from the Bonn station of apparatus for collecting the urine 

 and feces in metabolism experiments with cow^s, and two methods 

 of determining dry matter in feeding stuff's in connection with such 

 experiments. Several pieces of apparatus for soil investigation were 

 shown ])y the Rostock station, and the agricultural high school at 

 Berlin showed, l)y means of charts, 60 typical profiles of German 

 soils, together with anal3^ses of the same, and 12 polished marble 

 plates illustrating the solvent action of the roots of a considerable 

 number of common crops. The Tharand station made quite an elabo- 

 rate display of apparatus for testing seed as to purity and determining 

 their volume, and of the results of vegetation experiments on the 

 action on LeguminosBB of pure cultures of tubercle l)acteria, showing 

 by means of photographs the effect of diff'erent kinds of nitragin. 

 The exhibits of experimental work in dairying were made by the 

 stations at Kiel and Kleinhof-Tapiau and tht^ dair}' institute at 

 Hameln. These included different kinds of apparatus for the exami- 

 nation of milk, separation of constituents, etc., among which were a 

 Renke-Stutzer apparatus for determining the amount of dirt in milk, 

 cultures by Weigmann of bacteria for ripening cream (in liquid and 

 dried form), and a collection of photographs of bacteria isolated from 

 milk, butter, and cheese. There were various charts showing the 

 effect of period of lactation and feeding on the composition of butter 

 fat, and the results of systematic examination of the milk of 08 cows 

 during one oi- more periods of lactation at Kleinhof-Tapiau. 



The various pieces of apparatus displayed in the German exhibit 

 were described as to principle and method of use in the handbook 

 mentioned above. This added much to the interest and to an intelligent 

 understanding of the apparatus, and made possible a more thorough 

 study of the progress in methods of investigation. 



The Rothamsted station had :i small exhibit which consisted for the 



