17. Where it is desired to suppress an infectious process in the digestive system of cattle, the temporary employment of a stronger formaldehyde milk (1:25,000 to 1:16,000) under the direction of a veterinary physician is recommended. 18. In the suppression of “_Kälbersterbe_,” beside the increased requirements regarding the cleanliness of attendants’ clothing and body, of stable and stable utensils, the proper care of the navel with the aid of ⅖% aqueous solution of formaldehyde is recommended. 19. The radical suppression of bovine tuberculosis by means of my protective inoculation is to be sought for. 20. The following article shows the method of making these inoculations at present in use at Marburg. SYNOPSIS FOR PROTECTIVE INOCULATION OF CATTLE IN AGRICULTURAL PRACTICE. GENERAL CONSIDERATIONS. For the protective inoculation carried out by us in practice we make use of “Mxt. Tb.” in the form of our “Culture No. 1,” which has been studied by us for years and which we have minutely described in the _Beiträge_, Nos. 5 and 6. The accumulation of orders for this virus on the one hand and the multitudinous experimental labors in the institute here on the other, compelled us to rid ourselves of the technical labor of manufacture, weighing off and shipping of the virus, which accordingly has been undertaken by the local firm of Drs. Siebert & Ziegenbein. The virus, however, continues to be tested as to purity, virulence, etc., in the scientific department of the institute at Marburg. The virus is accompanied by directions for use which have already appeared in the _Zeitschrift für Thier-medicin_. These are as follows: I. SELECTION OF THE ANIMALS TO BE INOCULATED.--As a rule only animals without external evidences of disease, from three weeks to three months (for the first inoculation) should be inoculated. In healthy animals of this age a previous tuberculin test is unnecessary, even if the animal comes from a notoriously tubercular herd. II. NUMBERING THE INOCULATED ANIMALS.--Every inoculated animal must be marked with a running number. The marking must be of such a character as to be distinct, not liable to be mistaken for some other, and to last the lifetime of the animal. (Ear-marking, tattooing, etc.) If necessary, the marking is to be repeated should the first mark become indistinct. III. KEEPING OF RECORDS.--See under “Conditions governing the distribution of the virus, etc.,” p. 75.