162 MEMOIR OF DR. HARVEY. 



to see as much of you as I can, and for part of the time I hope 

 to accept your kindness ; but you have already advertised me of 

 a place for seaweed-picking near Boston, and I am anxious to 

 explore it if I can find accommodation on the coast. There are 

 so few rocky sea-bathing places in the Union, that this one has 

 the more attraction. 



Taking a hint from your wish for lectures on Algae, I have 

 thought of a subject which is the least hackneyed, or thread- 

 bare, that occurs to me. It is to trace the progressive organisa- 

 tion of the vegetable entity, — through the imperfect to the 

 perfect plants, as follows : — 



Lecture 1. The subject proposed, introductory observations, &c. 

 „ 2. Elementary forms of Veg. Diatomaceas and Desmidiacea?.. 

 „ 3. Alga? of the green series. 

 „ 4. Alga? of the red series. 

 „ 5. Algaj of the olive series. 

 „ 6. Lichens. 

 „ 7. Mosses. 



„ 8. Hepaticaj and Equisetacea?, Lycopodiaceai, &c. 

 ,, 9. True ferns — Polypodiacea?. 

 ,, 10. Fungi (the most aristocratic of Crypts ! " fruges consumere 



Nati !") 

 „ 11. Endogens and Exogens. Merely in outline to complete the 



group. 

 „ 12. General re'sume', showing the advance of organisation, the 



recurrence of types, &c, and conclusion. A poetical lecture ! 



You may be surprised at the order in which I place the 

 Cryptogamia, but I have my reasons, and you must wait for 

 them if you wish to know them. 



I shall have to make fifty or sixty new diagrams (a work I do 

 myself) ; but it is rather pleasant if I have time. 



Thank you for your very elaborate paper, though I have no 

 time to look at it. I am lecturing now three days in the week, 

 and making diagrams and writing copij for printers, occupy the 

 rest of my time. 



Most truly yours. 



