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Picea canadensis, "cat spruce". Of this species, needles and cones 

 were distilled. The former yielded o,iO3°/ oil; d 15 o 0,9216; 25,7% 

 ester, calculated as bornyl acetate. The odour of the oil points to 

 the presence of limonene or dipentene. The cones yielded o,2 5°/ 

 of a yellow oil, also with a limonene-like odour; d^o 0,899 (some 

 time after distillation). 



Picea rubens, "red spruce". Of this species also the oil from the 

 needles and cones was examined. The yield of needle oil came to 

 0,204 °/ ; di 6 o 0,9539; 66,2 °/ bornyl acetate; 7,76 °/ free borneol. 

 The odour of the cone oil resembled that of turpentine, the yield 

 amounted to o,38°/ ; d^o 0,860. 



Larix Americana. The yield of the oil distilled from needles and 

 twigs was o,i49°/ ; di 5 o 0,8816; ester-content 15,1% (calculated for 

 bornyl acetate). The fractional distillation gave the following results. 

 There passed over: — 



from 155 to 170 = 20,0 °/ ; from 170 to 180 = 38,4 °/ ; 

 „ 180 „ 190°= 11,2%; » l 9° » 200 = 9,2%; 

 „ 200 „ 240 = i4,8°/ . Residue = 6,4 °/ . 



On repeated fractional distillation, a fraction could be isolated 

 which boiled between 155 and 162 °, and in which pinene was 

 detected, (nitrosochloride, m. p. 108 [?]). The authors conclude from 

 their examinations that the oil consists of about 15,1 °/ esters and 

 for the rest largely of pinene. 



Pinus rigida, "pitch pine". 12 kilos leaves and twigs yielded only 

 0,2 cc. of a yellow oil with an extraordinary pungent odour, which 

 was not sufficient for analysis. 



Pinus resinosa, "red pine". The quantity obtained of this oil was 

 also too small for a chemical examination; the yield only amounted 

 to 0,001 °/o- The colour of the oil was brownish red, the odour 

 pungent and disagreeable. 



Oil from the cones of Picea excelsa. From the one year 

 old fruit-cones of the Norway spruce, Picea excelsa Lk., which had 

 been sent to us from Thuringia, we obtained a distillate which in 

 the rectified state had the following constants : di 5 o 0,8743; ct B — i9°i5 r ; 

 acid no. 1,8; ester no. 3,9 = 1,4% ester, calculated for bornyl acetate; 

 soluble in 7 and more vol. 90 per cent, alcohol. The oil had a 

 greenish yellow colour, and, contrary to the other conifer oils, had a 

 somewhat stale, musty odour. 



Oil of Pinus Sabiniana Douglas. On the occasion of some 

 examinations carried out by ourselves 1 ) with the oil from the turpentine 

 of this conifer which is found in California, we summarised also the 



a ) Report October 1906, 64. 



