X1V PREFACE. 
Blakeney and the other officers of the department for the accu- 
racy with which they kept us supplied with the latest scientific 
periodicals, and with such instruments and books of reference 
as we required. 
This account may perhaps appear unnaturally couleur de rose ; 
still, looking over it again, I can detect no exaggeration. There 
is, of course, another side to the picture. The work was done 
with the regulation expenditure of tissue; the strain, both men- 
tal and physical, was long and severe, and it has told a good 
deal upon all of us. i. 
C.Wyvitte Tuomson. 
