1899] A LHEORY OF SLEEP 139 
only for the last twenty or thirty years, and that beneath the shade of 
a most complete and dispiriting peace. There is a lack of teachers, 
books, laboratories, and intellectual vigour—the latter chiefly. Con- 
sequently, although it would make me happy, I dare not beg for the 
protection of the learned foreign corporations, considering myself un- 
qualified for it, but I will at least beg that some indulgence be shown 
regarding the imperfections with which all my works do surely abound. 
Mexico, Apri 30, 1899. 
