1888-89.] Haycraft and Duggan on Coagulation by Heat. 385 
applicable, is tbe separation of serum globulin from serum albumen. 
Serum globulin is precipitated at the atmospheric temperature on 
acidifying by a stream of carbon dioxide, or by tbe addition of 
weak acetic acid. This precipitation is not a complete one, how- 
ever, as Hammarsten has shown. The reason is, that, at the atmo- 
spheric temperature, part of the globulin remains in solution. 
This paper contains some of the results of a research, towards the 
expenses of which a grant of money was voted by the Scientific 
Grants Committee of the British Medical Association. 
Papers referred to in the Text. 
1. Wurtz, Dictionaire de Chemie, article “Albumine.” 
2. Henrijean, Contributions a V etude de l antisepsie. 
3. Hoppe-Seyler, Handbuch der Chemischen analyse. 
4. Schafer, Journal of Physiology , vol. iii. 
5. J. Bechamp, Nouvelles Recherches sur les Albumines. 
6. W. D. Halliburton, on Proteids of Serum, Journal of Physiol., vol. v. 
7. Corin and Berard, Travaux du Laboratoire de Leon Fredericq, vol. ii. , 
1887-8. 
8. M. C. Varenne, Recherches sur la Coagulation de l' albumine Jahresberichte 
der Anat. v. Phys., 1885, p. 249. 
9. Hammarsten, Archiv f. die gesammte Physiol., Bd. xvii,, 1878. 
Some New Points in Connection with Muscle 
Contraction. By Alexander James, M.D. 
(Read July 15, 1889.) 
The interval which elapses between tapping a muscle or tendon 
and the resulting movement of the limb has been estimated by 
many observers — Burckhardt, Tschirjieu, Waller, Brissaud and 
Francois Franck, Eulenberg, De Watteville, &c. — but the precise 
signification of these so-called reflexes is not yet fully understood. 
What follows is intended to add to our knowledge of this subject. 
The observations were made on a patient in the Boyal Infirmary, 
aged 26, who, as the result of a blow on the left side of the neck, 
sustained three years previously, presented (1) greatly impaired 
voluntary motor power in the left arm and left leg; (2) marked 
jerkings on tapping the tendons of the left supinator longus, left 
vol. xvi. 16/11/89 2 B 
