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The subject is, but in Karmaśāstra also, incidentally, many things are described which are related to the body.
Even though the things related to the body in Karma-siddhānta are said from an ancient method, their importance does not diminish just because of that. The main thing to see is that in Karmaśāstra, the structure of the body, its types, its strength, and the elements that are its cause, have been systematically stated, and by researching them, newness can also be brought and the importance of the scripture can also be proved.
Language-Śāstra-Similarly, in Karmaśāstra, there is also a discussion worth considering regarding language and the senses. From what element is language formed, how much time does it take to form? For its creation, it uses various japalo pani in different ways and by what means does it do so? What is the basis of the truth and falsehood of language? Which creatures can speak? Which species of creature has the power to speak in what kind of language? etc. Important and serious consideration of questions related to language is found in Karmaśāstra in a detailed manner.
Similarly, how many senses are there, what are they like, what are their various differences and what are their powers? Which creature has how many senses? What is the relationship between external and internal senses, what is their shape, etc.? Many kinds of thoughts related to the senses are found in Karmaśāstra.
It may be that all these thoughts may not be found in it in a systematic manner, but it should be kept in mind that the main subject of Karmaśāstra is something else, and in the context of its description, the body, language, senses, etc. have been considered as needed. Therefore, it is possible that a systematic compilation may not have been possible, but this does not prove the fault of Karmaśāstra, rather it will be called the glory of discussing the subject of many scriptures.