8 PTIVSTCAL GEOGRAPHY. 



furnished any facts for the text. Dr. Jackson himself took the opposite 

 direction, exploring between Nashua and Portsmouth. From thence he 

 travelled to Madison (then a part of Eaton), Mt. Chocorua (Williams and 

 Channing), Jackson, Randolph, Lancaster, Shelburne, back to Lancaster 

 and Dixville notch. Next he measured a section through Vermont, from 

 Lancaster to Lake Champlain. The facts derived from this line of sur- 

 vey, as well as on a return line farther south, are generalized in a section, 

 the substance of which I have reproduced in Fig. i. Meanwhile, Messrs. 

 Channing and E. E. Hale examined the northern frontier, or the Canadian 

 borders of New Hampshire and Vermont. The rest of the year's field- 

 work consisted of explorations in Littleton, Franconia, Landaff, Orford, 

 Lyme, Canaan, Grafton, Amherst, and a hasty trip from Amherst to 

 Keene. 



Third Years Work. The third report states that the towns which had 

 not been previously visited were examined as far as practicable. Those 

 mentioned are Epsom, Pittsfield, Barnstead, Strafford, Temple, Richmond, 

 Winchester, Hinsdale, Guilford, Vt, Warren, Springfield, Enfield, Canaan, 

 Gilmanton, Sandwich, Jackson, Mt. Crawford, Dalton, Warren, down 

 Connecticut river to Charlestown, Unity, and an excursion to Mt. Wash- 

 ington from Jefferson, by Messrs. Channing and Hale. This year's report 

 closes with a fuller sketch of the previous year's work of measuring sec- 

 tions across Vermont. 



BUILDING MATERIALS, METALLURGY, ETC. 



The economical part of the report describes granite, soapstone, slate, 

 quartz, limestone, scythe-stones, beryl, garnet, infusorial silica, ochres for 

 paints, plumbago, pyrites, and some other minerals. It is quite full in 

 metallurgical statements respecting iron, zinc, copper, lead, tin, silver, 

 gold, molybdenum, manganese, and arsenic. Many original chemical 

 analyses are given in connection with these economical and metallurgical 

 descriptions. 



The agricultural portion is divided into five parts : i. The origin and 

 distribution of soils. 2. Nature and origin of the organic and saline 

 ingredients of soils. 3. Chemical constitution of plants. 4. What ingre- 



