UNITED STATES DEPARTMENT OF AGRICULTURE 
BULLETIN No. 773 
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Contribution from the Bureau of Chemistry 
CARL L. ALSBERG, Chief 
Washington, D. C. 
PROFESSIONAL PAPER 
May 29, 1919 
CHEMICAL ANALYSES OF LOGAN BLACKBERRY 
(LOGANBERRY) JUICES. 
By R. S. HOLLINGSHEAD, 1 
Assistant Chemist, San Francisco Food and Drug Inspection Station, 
on Static 
CONTENTS. 
The Logan blackberry (Loganberry) 1 
Uses of the Logan blackberry 2 
Manufacture of Logan blackberry juice 2 
Purpose of investigation 3 
Preparation of the analytical samples 3 
Methods of analysis 4 
Results of analyses 6 
Discussion of results of analyses 12 
THE LOGAN BLACKBERRY (LOGANBERRY). 
The Logan blackberry, which is generally known as the Logan- 
berry, originated in 1881, on the grounds of Judge J. H. Logan, of 
Santa Clara, Cal., who grew it from the seed of the Aughinbaugh 
blackberry. The seedling was supposed to be the result of hybridiza- 
tion between the blackbeny and a red raspberry, presumably the 
Ked A twerp, which grew beside the blackberry parent 2> 3 > 4 . Recent 
investigations, however, throw doubt on this view and indicate that 
it is a variety of the trailing blackberry common to the Pacific coast. 5 
The plant is an exceedingly robust grower, showing unique foliage 
and cane growth, as well as fruit. The fruit, shaped like the common 
blackberry, is sometimes as long as 1J inches and of a dark color, 
similar to that of a dark red raspberry. 2 The berry has a characteris- 
tic flavor, resembling that of raspberries, both red and black, but more 
acid than either. A closely-related berry, introduced by Burbank, 2 
is the "Phenomenal," which is very similar to the Logan blackberry, 
1 Credit is due R. W. Clough, of the Bureau of Chemistry, for the analytical work on the Washington 
Logan blackberry juices reported in this bulletin. 
2 Wickson, E. J. The California Fruits and How to Grow Them (1914), p. 417. 
3 Shinn, C. H. Garden and Forest (1894), 7: 465-6. 
* Gardner, V. R. Biennial Crop Pest and Horticultural Report, 1911-12, pp. 59-G5. Oreg. Agr. Fxp. 
Sta. 
b Is the Hybrid Origin of the Loganberry a Myth? Journal of Heredity (1916), 7: 504-7. 
98221°— 19— Bull. 773 
