

TO 



SIR WILLIAM JACKSON HOOKER, 



KMGI1T OF THE ROYAL HANOVERIAN ORDER 

 LL. D. F. R. A. AND L. S. 



MEMBER OF THE IMP. ACAD. NAT. CUR. Etc. Etc. Etc. 



HONORARY MEMBER OF THE ROYAL IRISH ACADEMY, 



OF THE ROYAL MEDICAL AND CH1RURGICAL SOC. OF LONDON, 

 ETC. ETC. 



REGIUS PROFESSOR 

 OF BOTANY IN THE UNIVERSITY OF GLASGOW. 



THIS LITTLE TRACT 

 IS DEVOTEDLY INSCRIBED 



BY THE AUTHOR, 



