326 Heinrich Rose. 
ment. Still, when we compare his analyses with those of Rose, 
which followed them after an interval of but a few years, we 
receive an abrupt transition, a great change which the science 
ad in that time made. To whom was this step due? Not to 
Rose, for his career was but just begun: 
A short time after the death of Klaproth, a Text-book on 
Analytical Chemistry was published by Professor Pfaff of Kiel; 
it contained the results of the most recent investigations, and in 
arrangement and completeness far surpassed all previous com- 
pilations. And yet this work was so completely superseded by 
the treatise of Rose, published only eight years later, that it 1s 
now almost forgotten. The explanation is to be found in the 
circumstances under which the two treatises were compiled. 
e work of Pfaff was the exponent of the analytical views 
of Stromeyer and Klaproth, and the other chemists of that 
school; the treatise of Rose contained the new and more precise 
ideas of analysis which the experience of Berzelius had devel- 
oped. But Berzelius, though he has written a text-book upon 
general chemistry, which is a model for clearness and simplicity 
of style, has left no separate treatise upon analytical chemistry. 
to all who had attained a moderate proficiency in the science. 
With the appearance of Rose’s treatise, a new era was open 
to analytical chemistry. é 
In the preface to the last French edition of 1859, he has him- 
self given the best account of his great work. : 
‘‘ My first edition, published in 1829, was in one volume; it 
was intended principally for beginners. It contained the first 
attempt at a systematic plan of qualitative analysis. This plan 
hav 
