VI PEEFACE. 



Mr Jackson is not mentioned in the list of those 118 men 

 " who, though they never published anything upon the sub- 

 ject, have nevertheless contributed in some degree to im- 

 prove this part of the natural histoiy of their native coun- 

 try," which is given by Professor T. Martyn in his Plantce 

 Cantabrigienses. But the Rev. Richard Jackson, the founder 

 of the Jacksonian Professorship, was a Fellow of Trinity 

 College, and took his B.A. degree in the year 1727, his 

 M.A. in 1731. That he took an interest in Botany is shewn 

 by his founding a perpetual annuity to be paid to the " head 

 or chief gardener of the University Physic Garden," and by 

 several of the directions given for the guidance of his Pro- 

 fessor. In all probability he was the R. Jackson to whom 

 the Methodus belonged. 



It is hoped, and earnestly requested, that those botanists 

 who may use this Catalogue will communicate to me any 

 additional localities that they may observe, or any confirma- 

 tion of the older ones, and point out such improvements in 

 the book as may occur to them. 



St John's College, Cambridge. 

 26 April, i860. 



