Profession of "Chemistry specified under section 10
Notification No. 3881 was published on 31 July 1976. Its subject is Profession of "Chemistry specified under section 10.
This notifies a named person, body, fund or instrument for the purpose of a provision. Nothing in it changes the provision itself.
In exercise of the powers conferred by sub-section (23A) of section 10 of the Income-tax Act, 1961 (43 of 1961), the Central Government hereby specifies the profession of "Chemistry " for the purpose of the said section
Source: the Income Tax Department’s own published text — its page for this instrument.